What kind of anti-tank obstacles were used by germans in 1918? I know one of these was a concret-made prism filled of steel rails. Does anyone have any pic or info? And what about other kind of barricades?

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__________________

If ye break faith with us who die
We shall not sleep, though poppies grow
In Flanders fields.

Steel posts or rails driven vertically into the groundSteel posts or rails driven into the ground at approx 45 degrees, some times with the ends pointedBoth of the above set in concreteSimple concrete blocks, sometimes positioned so as to funnel tanks towards anti tank gunsCovered pits, sometimes water filledShaped concrete interlocking units sometimes called dragon's teethSimple anti tank ditches (wide trenches)Complex anti tank ditches (eg one side gently sloping leading to a vertical side - rather like a ha-ha in a English stately home garden but bigger - a ho-ho?)

Obstacles were sometimes used in conjunction with anti tank mines (funneling the tanks into the mine field) and possibly IRDs

Photo one shows German 45 degree AT barrierPhoto two shows German steel posts embedded uprightThe drawing is of defences on the Ostend sea front - the Germans got a whiff of Operation Hush but the wrong planned landing site. There is some evidence that this may have been the result of some RN planting of duff info. Despite the detail on the drawing the spikes were steel not wood.